public class demo1 {
    public static void main(String[] args) {
        Object object = new Object();
        Thread t1 = new Thread(() -> {
            synchronized(object) {
                System.out.println("wait之前");
                try {
                    object.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("wait之后");
            }
        });

        Thread t2 = new Thread(() -> {
            synchronized (object) {
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                System.out.println("发送通知");
                object.notify();
            }
        });
        t1.start();
        t2.start();

    }
}
